Patent US2848631A successfully refreshed from Google Patents.
Patent US2983706A successfully refreshed from Google Patents.
Patent US2952038A successfully refreshed from Google Patents.
US2952038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preventing the formation of voids and pock marks in the extrusion of olefin polymers
Assignee: Phillips Petroleum Co
•
Filing: 1957-01-17
•
Granted: 1960-09-13
•
Expires: 1977-01-17
Abstract
No abstract record available.
Inventors
- 👤 Robert R Goins
- 👤 Edward J Kosinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:01
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; Y; Y10; Y10S; Y10S425/00; Y10S425/101; Y10S8/00; Y10S8/09; Y10S8/10; Y10T; Y10T137/00; Y10T137/8593
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
IN THE PROCESS OF EXTRUDING 1-OLEFIN POLYMERS AS STRANDS, THE IMPROVEMENT COMPRISING PASSING THE EXTRUDED STRAND THROUGH A FIRST FLUID HAVING A TEMPERATURE IN THE RANGE 40 TO 150*F. FOR A TIME TO HARDEN ONLY THE SURFACE OF SAID STRAND, PASSING THE STRAND THROUGH A SECOND FLUID WHEREIN THE HEAT OF SAID STRAND IS REDISTRIBUTED THEREBY SOFTENING SAID SURFACE AND THEREAFTER PASSING SAID STRAND THROUGH A THIRD FLUID HAVING A TEMPERATURE OF AT LEAST 150*F. AND AT LEAST 20*F. ABOVE SAID FIRST FLUID AND BELOW THE SOFTENING POINT OF THE POLYMERS FOR A TIME SUFFICIENT TO HARDEN THE ENTIRE STRAND.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |